The Old Testament / Tanakh includes appealing prophecies like dating for Messiah's arrival (Daniel 9), descriptions of his death (According to Maimonides, this is the Servant's "crushing" in Isaiah 42; Christianity sees it in Isaiah 52-53), and the future resurrection of the dead (Isaiah 26). What makes those prophecies reliable, and how does the prophecy function? It seems that theoretically, there could objectively exist such a thing as a gift of prophecy, and that the Lord could guide the Biblical prophets into true predictions. But science seems skeptical about the reliability to perform foretelling supernaturally. And it seems that there are moral people whom God inspires in the world (like civil rights activists), but I don't know that their inspiration and morality means they become reliable precise oracles for the nation's political future, like giving a 30 year deadline for passing certain laws. The Catholic New Advent Encyclopedia distinguishes prophets' intuition and sense of prophecy and actual, certain prophecies: http://www.newadvent.org/cathen/12473a.htm Maybe prophesying is not necessarily from God, even when the prophet is a moral, inspired believer like the ancient prophets were? In that case, it seems we have to evaluate whether foretelling is scientifically reliable. Otherwise, how do we know that the Biblical prophecies must be correct? The Encyclopedia also talks about nonChristian prophecy as sometimes being legitimate: And it even says that post-Biblical prophecies by even inspired Christian saints could be mistaken: If Christian saints' predictions could be mistaken, it makes me uncertain how reliable the Biblical ones must be.